单项选择题

Gaining a new customer costs keeping an old one.

A．as many as five times
B．five times as many as
C．as much as five times
D．five times as much as
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单项选择题
To master a foreign language like French requires hard work, so you study
A．should
B．must
C．can’t
D．may not
单项选择题
Soloudly _ that even people in next room could hear him.
A．did he speak
B．dose he speak
C．he spoke
D．he speaks.
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